Mapping P-wave azimuthal anisotropy of the New Madrid seismic zone

• Published in: Physics of the earth and planetary interiors Vol. 295; p. 106296
• Main Authors: Wang, Zewei, Zhao, Dapeng
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.10.2019
• Subjects: Anisotropic tomography; Intraplate earthquakes; Mantle dynamics; New Madrid seismic zone; Anisotropic tomography; Intraplate earthquakes; Mantle dynamics; New Madrid seismic zone
• ISSN: 0031-9201; 1872-7395
• DOI: 10.1016/j.pepi.2019.106296

We determine a detailed tomographic model of 3-D P-wave azimuthal anisotropy in the crust and upper mantle beneath the New Madrid seismic zone (NMSZ) using a large number of high-quality arrival-time data of 877 local earthquakes and relative travel-time data of 1511 teleseismic events recorded at 62 USArray stations. The tomographic inversion is conducted by using a limited-memory Broyden–Fletcher–Goldfarb–Shanno algorithm for bound constrained optimization. Because damping regularization is not required in this inversion scheme, the obtained results are less affected by human subjectivity. A prominent low-velocity zone with NE-SW fast velocity directions of azimuthal anisotropy down to ~160 km depth beneath the NMSZ is imaged, which may reflect upwelling mantle materials probably triggered by passage of the Bermuda hotspot from the southwest of the Mississippi embayment. Our results also reveal a subhorizontal high-velocity anomaly around the Moho discontinuity with a width of ~150–200 km, confirming the existence and defining the geometry of a lens-shaped high-density rift pillow near the Moho, which may result from the mantle upwelling. NW-SE fast velocity directions of azimuthal anisotropy appear in the lower crust beneath the Mississippi embayment. This result may reflect recent weakening of a detachment fault above the rift pillow, which drives recurrently sinking of the rift pillow and, as a consequence, causing large repeating intraplate earthquakes in the NMSZ. •A low-velocity zone with NE-SW FVDs beneath New Madrid reflects mantle upwelling induced by the Bermuda hotspot passage•Sinking of a lens-shaped high-density and high-V rift pillow may drive the repeating large intraplate earthquakes in New Madrid•The NW-SE FVDs in the lower crust may reflect recent weakening that is responsible for the rift pillow sinking